On the determination of verticality and Eötvös effects in absolute gravimetry

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00177016%3A_____%2F18%3AN0000005" target="_blank" >RIV/00177016:_____/18:N0000005 - isvavai.cz</a>

Alternative codes found

RIV/00025615:_____/18:N0000037

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

On the determination of verticality and Eötvös effects in absolute gravimetry

Original language description

We describe a new method for the accurate alignment of verticality in absolute gravimeters with macroscopic objects that allows simultaneous determination of the Eötvös effect. The method is based on measurements of lateral motion of freely falling objects by a position sensitive detector, and has been used experimentally for one FG5 and one FG5X gravimeter. As for the verticality effect, we show that the current method of verticality alignment by using the reflection off the geopotential surface placed outside the vacuum dropping chamber is insufficient, and that systematic errors exceeding 1 μGal might be expected—as demonstrated for FG5X-251. On the other hand, the new method of verticality alignment, based on minimizing the measured lateral accelerations, allows the reduction of systematic errors to about 0.1 μGal. Moreover, the measurements underlying the alignment can be used for determination of the Eötvös effect, which depends on the lateral velocity of the falling object in the east–west direction. The results for two FG5(X) gravimeters are presented, with Eötvös effects below 1 μGal that, however, cause biased gravity values so that relevant corrections should be applied. The method we are presenting does not allow determination of the verticality and Eötvös effects for particular drops. To do so, optical paths in the interferometer should have to be re-designed. Nevertheless, it is possible to determine both effects with a standard uncertainty better than 0.2 μGal using less than 50 drops carried out in a nonmeasurement mode.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10505 - Geology

Project

<a href="/en/project/GA16-14105S" target="_blank" >GA16-14105S: Advanced processing of absolute gravity measurements and investigation of systematic instrumental effects</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Metrologia

ISSN

0026-1394

e-ISSN

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Volume of the periodical

55

Issue of the periodical within the volume

4

Country of publishing house

GB - UNITED KINGDOM

Number of pages

9

Pages from-to

451–459

UT code for WoS article

000434677400001

EID of the result in the Scopus database

2-s2.0-85051399017